They are known health concerns for those breeds. Every breed has known health concerns. Some of these are more common in the breed than others. Most breeders test for these problems before breeding. Example: If a breeder uses a dog with epilepsy for breeding, then the chance of the offspring developing epilepsy is greater. Dogs with "known" health problems should not be used in a breeding program. Go to the National Breed Club for the breeds that you have and you can find a lot of information on current health concerns for that breed. ltlgto